AutoCodes – BMW – P0117 BMW

P0117 BMW Code - Engine Coolant Temperature Sensor 1 Circuit Low

Quick Answer

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. Common causes include Low engine coolant level, Faulty Engine Coolant Thermostat, Faulty Engine Coolant Temperature (ECT) sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0117 BMW indicates Engine Coolant Temperature Sensor 1 Circuit Low.
Common causes: Common causes include Low engine coolant level, Faulty Engine Coolant Thermostat, Faulty Engine Coolant Temperature (ECT) sensor.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 29,627

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 07, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0117 BMW Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor that is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. The Diagnostic Trouble Code (DTC) will be set when an excessively low voltage from the sensor is sent to ECM.

OBDII Code P0117 BMW - Engine Coolant Temperature Sensor 1 Circuit Low - AutoCodes.com — P0117 BMW Code - Engine Coolant Temperature Sensor 1 Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0117 BMW?

Low engine coolant level
Faulty Engine Coolant Thermostat
Faulty Engine Coolant Temperature (ECT) sensor
Engine Coolant Temperature sensor harness is open or shorted
Engine Coolant Temperature sensor circuit poor electrical connection

How to Fix the DTC P0117 BMW?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0117 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0117 BMW code?

Need more information on how to fix the P0117 BMW code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0117 BMW Code

1. What does the OBDII code P0117 mean on a BMW?

P0117 indicates that the Engine Coolant Temperature (ECT) Sensor 1 has reported a voltage reading lower than the expected range, suggesting a circuit issue or incorrect sensor performance.

2. What are the symptoms of the P0117 code in a BMW?

Symptoms may include engine overheating, poor fuel economy, difficulty starting, erratic temperature gauge readings, or the engine running in "limp mode."

3. What causes the P0117 code on a BMW?

Common causes include a faulty coolant temperature sensor, damaged or corroded sensor wiring, low coolant levels, or a malfunctioning engine control module (ECM).

4. Can I drive my BMW with the P0117 code?

It is not recommended to drive with this code, as it can affect engine performance and may lead to overheating, potentially causing severe engine damage.

5. How do I diagnose the P0117 code on a BMW?

Start by checking the coolant level and inspecting the ECT sensor and its wiring for damage or corrosion. Use a multimeter to test sensor voltage and resistance. If necessary, scan for additional codes.

6. How do you fix the P0117 code on a BMW?

Repairs may include replacing the ECT sensor, repairing damaged wiring or connectors, refilling coolant to the proper level, or reprogramming the ECM if needed.

7. Where is the Engine Coolant Temperature Sensor located on a BMW?

The ECT sensor is typically located near the thermostat housing or in the cylinder head, depending on the BMW model.

8. What tools are needed to fix the P0117 code?

Basic tools include a multimeter, OBDII scanner, coolant tester, and appropriate hand tools for removing and replacing the sensor.

9. Will a faulty coolant temperature sensor cause my BMW to overheat?

Yes, a malfunctioning ECT sensor can lead to inaccurate temperature readings, causing the ECM to mismanage cooling functions, potentially resulting in overheating.

10. How much does it cost to fix the P0117 code on a BMW?

The cost varies depending on the issue. Replacing the ECT sensor typically costs between $100 and $300, including parts and labor. Wiring repairs or ECM issues may increase the cost.